Adrien Graham Wallace was sentenced Tuesday to life in prison without the possibility of parole for the savage murders of his mother and nephew two years ago.

A Clackamas County jury convicted Wallace of aggravated murder last week. After conferring with his attorneys, Wallace decided to forgo the sentencing phase of the trial.

Jurors would have decided whether Wallace would receive the death penalty, a true-life sentence or a minimum of 30 years in prison.

Wallace also waived his appeal rights as part of an agreement with prosecutors.

It took a Clackamas County jury about 12 minutes to convict Adrien Graham Wallace of aggravated murder in the execution-style murders of his mother and nephew.

Wallace did not deny killing his mother, Saundra Sue Wallace, and 16-year-old nephew, Nicholas "Nick" Brian Juarez, on June 4, 2012. They were shot several times at close range with a military-style rifle.

Wallace relied on an insanity defense and claimed he was acting on orders from God.

Wallace did not speak at the sentencing, but one of his attorneys, David Falls, read a statement Wallace had written.

"I have always wanted to tell you everyone I am sorry," Wallace said. "I am sorry I brought this sort of horror into your lives."